LED's I can try disabling the alternators but the radio is fine when I am angling or lifting the plow which draws a ton more power than the lights. Also I have an electric radiator fan which doesnt effect the radio, its only the lights.
If the noise is only in the RF portion of radio (not CD / USB) you might try putting bypass capacitors across the leads of each light, right at the fixture... or even internal to the fixture if that's possible. The closer you can connect them to the noise source, the better.
My definition of “bypass capacitors” is .1uF ceramic disk capacitor (about the size of a nickel) in parallel with a small electrolytic capacitor (~50uF 16V, about the size of a Chiclet). Most electrolytic capacitors are polarized, so be sure to connect the negative lead to NEG.
This *might* help mitigate noise generated by the LEDs, i.e., by shunting it at the fixture and preventing it from propagating into the wiring (which acts as an antenna). Or, it might not
I have a number of other ideas that are probably best to try first, to isolate / identify the problem. PM me if you want.
Here's a couple links to Mouser Electronics showing the parts:
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